A cave network located at the southernmost tip of mainland Greece was once believed to be an entrance to Hades.

The ruins of an abandoned medieval city where the last Byzantine emperor was crowned.

This town named for the ancient God of War is home to fewer than a thousand people, but it's the birthplace of the Greek Revolution.

This candy-colored storybook village originated as a 19th-century Methodist campground.

The oldest platform carousel built in the United States continues to delight children in Martha’s Vineyard.

The filming location of a shark attack in Steven Spielberg's famous shark movie.

This rusted shipwreck directly in front of a century-old abandoned lighthouse looks almost surreal.

This wrecked ghost ship has been rusting on a Greek beach since the 1980s.

An abandoned boat that's been stranded mysteriously for decades.

A crypt believed by many Congolese to be a center of black magic.

Abandoned ships along a deserted beach feel like the set of a post-apocalyptic thriller.

This overgrown mountain village has been abandoned for nearly a century.

This nearly abandoned "company town" is a ghost of Puerto Rico's once-lucrative sugar industry.

The remains of a remote village that once housed over 1,200 dam workers and their families.

Wander among the abandoned ruins of this once-powerful medieval town.

Faces carved into the cliffs create an otherworldly walking trail.

The tragic reality of a town riddled with rumors of haunts, chemical spills, and serial killers.

The intricate stonework of Machu Picchu serves as a testament to Incan engineers.

This Cape Cod museum exhibits what it claims is the only authenticated pirate treasure in the world.

Collapsing castle on the Hudson river was once the storage site of military surplus business.

Tropical paradise strewn with hundreds of World War II wrecks.

It's believed this golden brick is part of the legendary lost Aztec treasure.

At nearly 1,000 feet long, this astonishing glass suspension bridge is one of the longest in the world.

A cliff-hanging restaurant.